e/Irregularity of a surface

Information
has gloss	eng: In mathematics, the irregularity of a complex surface X is the Hodge number h0,1= dim H1(OX), usually denoted by q . The irregularity of an algebraic surface is sometimes defined to be this Hodge number, and sometimes defined to be the dimension of the Picard variety , which is the same in characteristic 0 but can be smaller in positive characteristic.
lexicalization	eng: Irregularity of a surface
instance of	c/Algebraic surfaces